Steam generating system



Nov. 29, 1932. H. .1. KERR 1,889,071

STEAM GENERATING SYSTEM Filed Fleb. 2, 1929 2 Sheets-Sheet 1 NvENToR Elm/J l ATTOR N EYS 2 Sheets-Sheet 2 Nov. 29, 1932. H. J. KERR STEAM GENERATING SYSTEM Filed Fe b. 2, 1929 INVENTOR ATTORNEYS o u oo o w. a o o gauw M o we? o o u wow o unen o o aao o o c @awo aww.. o d uuoa ou 0 v o o ooa nl. c o a o o o Vl o wenn sci4 o o son@ una., o B o mwen waiA O o 7a maw own. o o o u waw n m. o o o muuu nu. o o aou a u o o o @00 D o o none con 0 0 of. u o o non@ own. o o o una vom. o una o o nano 6. o o o s. o. o mman n. o o o o a HHIH HHHHI Patented Nov. 29, 1932 NETE` l; HOWARD J. KERK, OF WESTFELD, NEW JERSEY, ASSIGNOR TO THE BABCOCK & WILCOX COMPANY, Ol? BAYONNE, JERSEY, A CORPORATION F NEW JERSEY STEAL/I GENERATING SYSTEM Application filed. February 2, 1929.

This invention relates to a steam generator comprising a main boiler and also a furnace wall cooling tube boiler. Steam may be passed from the furnace wall cooling tube boiler through the super-heater of the main boiler while startino' up, or it may be passed to a point where it would be utilized, without passing it through the superheater, or it may b-e blown to waste. The steam from the furnace wall cooling` tube boiler is passed into panying the upper edge of the rear wall of the furnace. A corresponding drum 3 is located near the upper edge of the front wall at a higher elevation, the drums 3 and 3 being connected by a bank of inclined tubes 4. A

feed water inlet pipe 5 is shown leading to the drum 37 although the water may be fed into other portions of the boiler. One or more tubes 6 extend from the lower portion of the drum 3 to each distributing header 7.

' Tubes 8 lead from the headers 7 to headers 9 located on opposite sides of the ash hopper at the lower portion of the furnace. Rows of tubes 10 extend in upwardly inclined directions from the headers 9 along the side walls of the ash hopper to headers 11 and 12 located at the lower edge of the front and rear walls, respectively. A row of tubes 13 eX- tends upwardly along the rear wall of the furnace from the header 12 to the header 14 located near the upper edge of the rear wall of the furnace. A row of tubes 15 extends in an inclined direction across the upper portion of the furnace 1 from the header 14 into the steamy and water drum 3. A row of tubes 16 extends upwardly along the front Serial No. 337,099,

wall of the furnace from the header 11 into the steam and water drum 3.

Tubes 17 extend from the distributing header 7 to horizontal headers 18 located along the lower edges of the side walls of the furnace 1. A row of side wall tubes 19 extends from each header 18 to the header 20 located near the upper edges of the side walls of the furnace. Tubes 21 extend from the headers 2O into the steam and water drum 3.

A boilerl of a well known type may be located above the furnace 1 on the other side of the bank of tubes 4, or this boiler, which may be called the main boiler, may be lo cated at any other convenient position where it would be heated by gases leaving the furnace 1. The boiler illustrated in the drawings is one of the Babcock & `Wilcox type,hav ing a steam and water drum 25 into which a feed water pipe 26 enters. Nipples 27 connect the water space of the steam and water drum 25 to downtake headers 28 that are connected by a bank of inclined tubes 29t0 uptake headers 30 that are in turn connected by circulating tubes 31 to the steam space of the steam and water drum 25.

A dry pipe 32 is provided in the steam space of the steam and water drum 25 from which dry pipe a tube 33, provid-ed with a valve 34 near the steam and water drum, leads to the inlet header 35 of the superheater 36 from the outlet 37 of which a pipe leads to the steam main. s

A pipe 40 leads from the steam space of the steam and water drum 3 and is connected to the pipe 33 through a branch having a valve 41 therein. A valve 42 is provided in an outlet from the pipe 4() which may lead either to waste or to a separate place of use for steam. A branch pipe 43 provided with a valve 44 leads from the pipe 40 into a pipe 45 longitudinally disposed in the steam space of the steam and water drum 25, this pipe 45 having holes 45 along the bottom side thereof. A safety valve 46 is provided on the drum 3 and a safety valve 47 on the drum Q5. An leconomizer is indicated at 48.

The operation is as follows:

The combustion that takes place in the furnace l heats the furnace Wall tubes and the products of combustion pass upwardly across the rovv of tubes l5, bank 4 and the heating surfaces of the main boiler, thence passing out between the nipples 27 and over the tubes of the economizer 48. y

Due to the fact that steam Will be generated in the furnace Wall tubes before steam is generated in the main boiler, provision is made for passing this steam through the superheater 36 of the main boiler Without allowing any of it to pass into the main boiler While starting up. For this purpose the valves 34, 42 and 44 are closed and the valve 4l is opened, thereby permitting the steam generated in the furnace vvall tube boiler to pass directly from the pipe 40 through the valve 4l and pipe 33 into and through the superheater 36 'Without entering the main boiler. In this Way the superheater tubes are protected from being burned while the boiler is being started up. Trouble is also obviated that might occur if the steam Were permitted to enter the drum 25 above a colder body of Water and suddenly condense to cause severe bumping or Water hammer.

By the arrangement of pipe connections and valves above described the steam generated in the furnace wall tube boiler may be conducted avvay Without entering the main boiler or the superheater. ln order lto do this the valves 41 and 44 are closed and valve '42 opened. rlhe steam passing out through the valve 42 may be used Where convenient, or it may be blown to Waste.

In the normal operation of the boiler after the main boiler has generated steam to the proper pressure, the valves 4l and 42 are closed and the valves 34 and 44 are opened, thereby causing the steam from the furnace Wall tube boiler to pass through the pipes 40 and 43 and become mingled With the steam in the drum 25 from the main boiler. he steam or mixture of steam and Water passing through the pipes 40 and 43 enters the distributing pipe 45 from Which pipe Water that Was contained in the steam is distributed through the small holes 45 in the bottom of this pipe along the length of the steam and Water drum. rllhe steam generated by the main boiler together with the steam generated by the furnace Wall cooling tub-e boiler iiovvs, during normal operation, through the pipe 33 into the superheater 36, the superheated steam passing out through the outlet header 3'? to the steam main.

rlhe main boiler and the furnace Wall cooling tube boiler have their steam spaces connected during normal operation, but each one has a feed Water inlet separate from the other one and the Water level in each boiler is maintained at the proper point for that boiler independently of the Water level of the other boiler.

l claim:

l. in a steam generating system, a fur-V nace, a main boiler having a superheater, a boiler having tubes along the Walls of said furnace and means to pass steam from said last named boiler through said superheater Without its entering the main boiler during the starting up period, and means to pass steam from said last named boiler into said main boiler during normal operation.

2. ln a steam generating system, a furnace, a main boiler having a superheater, a boiler having tubes along the Walls of said furnace and means to pass steam from said last named boiler into said main boiler during normal operation, said means comprising a distributing pipe located in the steam space of said main boiler'.

3. ln a steam generating system, a furnace, a main boiler having a superheater, al boiler having tubes along the Walls of said furnace and means to pass steam from said last named boiler through said superheater Without its entering the main boiler during the starting up period, and means to pass steam from said last named boiler into said main boiler during normal operation, the steam from both boilers passing through said superheater during normal operation.

4. ln a steam generating system, tvvo boilers, one of said boilers being arranged to generate steam prior to the other during starting-up periods, a furnace for heating both of said boilers, a superheater, means for passing steam from the boiler which first generates steam through the steam space of said other boiler to said superheater during normal operation, and means for passing steam from the boiler which. lirst generates steam directly to said superheater during starting-up periods.

5. ln a steam generating system, a furnace, tivo boilers, one of said boilers being heated mainly by radiant heat from said furnace and the other one largely by convection heat from said furnace, a superheater, means for passing steam from said radiantly heated boiler through the steam space of said other boiler to said superheater during normal operation, and means for passing steam from said radiantly heated boiler directly to said superheater during starting-up periods.

6. In a steam generating system, a furnace, a direct fired boiler having steam generating elements at the furnace, an indirect fired boiler having steam generating elements spaced from the furnace, a superheater, and means to connect said superheater to one of said boilers and disconnect it from the other one during the starting up period.

7. Steam generating apparatus comprising a furnace, a Water tube boiler including steam generating surface and a steam and Water drum connected to said steam generatn ing surface, a steam superheater arranged in the path of the heating gases leaving said furnace, a second Water tube boiler including steam generating surface so arranged relative to said furnace that steam is generated therein during starting-up periods subsequent to steam generation in the steam generating surface of said first boiler and a second steam and Water drum connected to the steam generating surface of said second boiler, a conduit connecting the steam spaces of said steam and Water drums, a second conduit connecting the steam and Water drum of said second boiler to said superheater, a third conduit arranged to by-pass the steam and Water drum of said second boiler and connecting the other conduits, and valves associated With each of said conduits and operable to pass the steam generated in said boiler directly to the steam and Water drum of said second boiler during nory mal operation and to pass the steam generated in said first boiler directly to said superheater during starting-up periods.

8. Steam generating apparatus comprising a furnace, a Water tube boiler including steam generating surface arranged to be mainly heated by the absorption of radiant heat from said furnace and a steam and Water drum connected to said radiant heat absorbing steam generating surface, a steam superheater arranged in the path of the heating gases leaving said furnace, a second Water tube boiler including steam generating surface arranged to be mainly heated by contact with theheating gases leaving said furnace and a steam and Water drum connected to said convection heat absorbing steam generating surface, and a valved conduit system connecting the steam spaces of said steam and Water drums to one another and the steam space of each steam and Water drum directly to said superheater and operable to pass the steam generated in both of said boilers to said superheater during normal operation and to pass the steam generated in said first boiler only directly to said superheater during starting-up periods.

9. Steam generating apparatus comprising a furnace, a Water tube boiler including steam generating surface arranged to be mainly heated by the absorption of radiant heat from said furnace and a steam and Water drum connected to said radiant heat absorbing steam generating surface, a steam superheater arianged in the path of the heating gases leaving said furnace, a second Water tube boiler including steam generating surface arranged to be mainly heated by contact With the heating gases leaving said furnace and a steam and Water drum connect-ed to said convection heat absorbing steam generating surface, a conduit connecting-the steam spaces of said steam and Water drums, a second conduit connecting the steam and Water drum of said second boiler to said superheater, a third conduit arranged to by-pass the steam and Water drum of said second boiler and connecting the other conduits, and valves associated With each of said conduits and operable to pass the steam generated in said first boiler directly to the steam and Water drum of said second boiler during normal operation and to pass the steam generated in said first boiler directly to said superheater during periods of subnormal steam generation in said second boiler.

l0. Steam generating apparatus comprising a furnace, boiler heating surface arranged to absorb heat mainly by contact with heating gases from said furnace,a steam and Water drum connected to said convection heated surface, boiler heating surface arranged to absorb heat mainly by radiation from said furnace, conduit means arranged to conduct the steam generated in said radiant heat absorbingsurface directly to said drum, and means associated With said conduit means for bypassing the steam generated in said radiant heat absorbing surface about said drum during starting-up periods.

HOWARD J. ,KEER 

